20801471 has 2 divisors, whose sum is σ = 20801472. Its totient is φ = 20801470.

The previous prime is 20801467. The next prime is 20801479. The reversal of 20801471 is 17410802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20801471 - 2² = 20801467 is a prime.

It is a super-3 number, since 3×20801471³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20801479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10400735 + 10400736.

It is an arithmetic number, because the mean of its divisors is an integer number (10400736).

Almost surely, 2^20801471 is an apocalyptic number.

20801471 is a deficient number, since it is larger than the sum of its proper divisors (1).

20801471 is an equidigital number, since it uses as much as digits as its factorization.

20801471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 20801471 is about 4560.8629665887. The cubic root of 20801471 is about 275.0202563591.

The spelling of 20801471 in words is "twenty million, eight hundred one thousand, four hundred seventy-one".